Merge branch 'stable-3.2' into pandora-3.2

[pandora-kernel.git] / fs / namei.c

diff --git a/fs/namei.c b/fs/namei.c
index ac6d214..f3069a3 100644 (file)
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -852,7 +852,7 @@ static int follow_managed(struct path *path, unsigned flags)
                mntput(path->mnt);
        if (ret == -EISDIR)
                ret = 0;
-       return ret;
+       return ret < 0 ? ret : need_mntput;
 }
 
 int follow_down_one(struct path *path)
@@ -900,6 +900,7 @@ static bool __follow_mount_rcu(struct nameidata *nd, struct path *path,
                        break;
                path->mnt = mounted;
                path->dentry = mounted->mnt_root;
+               nd->flags |= LOOKUP_JUMPED;
                nd->seq = read_seqcount_begin(&path->dentry->d_seq);
                /*
                 * Update the inode too. We don't need to re-check the
@@ -1093,8 +1094,10 @@ static struct dentry *d_inode_lookup(struct dentry *parent, struct dentry *dentr
        struct dentry *old;
 
        /* Don't create child dentry for a dead directory. */
-       if (unlikely(IS_DEADDIR(inode)))
+       if (unlikely(IS_DEADDIR(inode))) {
+               dput(dentry);
                return ERR_PTR(-ENOENT);
+       }
 
        old = inode->i_op->lookup(inode, dentry, nd);
        if (unlikely(old)) {
@@ -1213,6 +1216,8 @@ retry:
                path_put_conditional(path, nd);
                return err;
        }
+       if (err)
+               nd->flags |= LOOKUP_JUMPED;
        *inode = path->dentry->d_inode;
        return 0;
 }
@@ -1750,10 +1755,11 @@ static struct dentry *__lookup_hash(struct qstr *name,
  * needs parent already locked. Doesn't follow mounts.
  * SMP-safe.
  */
-static struct dentry *lookup_hash(struct nameidata *nd)
+struct dentry *lookup_hash(struct nameidata *nd)
 {
        return __lookup_hash(&nd->last, nd->path.dentry, nd);
 }
+EXPORT_SYMBOL(lookup_hash);
 
 /**
  * lookup_one_len - filesystem helper to lookup single pathname component
@@ -2134,7 +2140,7 @@ static struct file *do_last(struct nameidata *nd, struct path *path,
                /* sayonara */
                error = complete_walk(nd);
                if (error)
-                       return ERR_PTR(-ECHILD);
+                       return ERR_PTR(error);
 
                error = -ENOTDIR;
                if (nd->flags & LOOKUP_DIRECTORY) {
@@ -2146,6 +2152,10 @@ static struct file *do_last(struct nameidata *nd, struct path *path,
        }
 
        /* create side of things */
+       /*
+        * This will *only* deal with leaving RCU mode - LOOKUP_JUMPED has been
+        * cleared when we got to the last component we are about to look up
+        */
        error = complete_walk(nd);
        if (error)
                return ERR_PTR(error);
@@ -2214,6 +2224,9 @@ static struct file *do_last(struct nameidata *nd, struct path *path,
        if (error < 0)
                goto exit_dput;
 
+       if (error)
+               nd->flags |= LOOKUP_JUMPED;
+
        error = -ENOENT;
        if (!path->dentry->d_inode)
                goto exit_dput;
@@ -2223,6 +2236,10 @@ static struct file *do_last(struct nameidata *nd, struct path *path,
 
        path_to_nameidata(path, nd);
        nd->inode = path->dentry->d_inode;
+       /* Why this, you ask?  _Now_ we might have grown LOOKUP_JUMPED... */
+       error = complete_walk(nd);
+       if (error)
+               return ERR_PTR(error);
        error = -EISDIR;
        if (S_ISDIR(nd->inode->i_mode))
                goto exit;